Recent content by BayouRadioAmplifier

just happened in New Orleans the other day. https://www.wwltv.com/article/news/local/orleans/tesla-catches-fire-at-charging-station/289-8a9f5cb6-943c-484f-b406-2e34f194ed62 in New York City, and over the pond, careful of them e-bikes: Bradford fatal house fire started by charging e-bike...

hmmmm! I like working on these radios. these 2950/2970/2995 types. so where can I find this schematic for this board EPT6950016A on this radio? in case I get one to repair.

Yes, usually the "assclowns mods" are to disable the TX ALC, by turning it way off, or by cutting out the transistors/diodes in the ALC circuit, as was done on some Uniden HR2510's I was given. You can get by in AM with the ALC and AMC disabled, but in SSB it sounds super bad. I would set the...

First, I would put that shorting bar back in. key radio up in LSB/USB mode, no audio into MIC, and measure the voltage at either side of inductor L50 to ground and adjust VR20 and it should go up to .7 volts. it should be around .7 volts at L35 since the bias works on that transistor when...

oh, also on this "B" radio that looked like new, but had problems. it had that newer fat stock Cobra microphone. The element was bad. so no transmit audio. so I use an older "coffin mic" on it. I have found on a few other newer stock Cobra fat mics, (not sure if these mics have a nickname.?)...

the "Made in China" radio. one of them was given to me. it was messed up with a few modifications. it was drifty in SSB. I rewired it back to stock. Then one day, it would not change channels. I found a PLL problem. and found information in this website to this common problem in that...

hmmmmmm! typical problem. sounds like relay contacts. clean the contacts. at the antenna switching contacts. rubbing alcohol and a piece of paper to wipe the contacts, all wetted in rubbing alcohol. when in transmit, all the RF power just arcs through the bad contacts.

Yes, have an 811H I use on the Amateur bands. and I have some amplifiers I am repairing for others. But have built MOSFET class-E H.F. AM transmitters, antennas, transmatches, etc.

back in the late 70's "Solid State Design for the Radio Amateur" was the book for me. It gives examples of designing little RF amplifiers, and shows what you need to know. also some other book, "RF Circuit Design" so Tickfawriver, I am down here near Thibodaux, and also worked in the...

here is a stack of amplifiers I took to "repair" I got two working after figuring out what the last guy did to screwed them up even worse. I don't need this!! Then gave the rest of them back.

yep, somebody screwed it up! Usually on these Texas Star / Palomar amps, I find them not working because it was overdriven. So the T/R relay circuit is burned out, and if the amp has a variable resistor on the RF input, it is burned out also. And then somebody tried to repair the T/R...

I would check out the PLL circuit. check the VCO to be on a certain frequency when radio is set to 28,000 kHz. there is a procedure in CB Tricks.

yes, the FCC is not a law enforcement agency. I had them come to my house with a county sheriff deputy, back in 1993 or so. After I refused the FCC guy with a "little badge" entry into my house, he told the sheriff there is nothing they could do, and they took off. Then I got letters in the...

I was all over inside one of these radios last year. it was worked on by a few. it had over 10 amps current when keyed up in SSB, no audio in, so no RF out, and got hot. the bias adjustments all messed up, on the main board, and the external amplifier. IRF520s were changed, and I believe...

and yes, the 2 watt resistor needed at the input circuit if a few watts of input power, if it is a RF power amp. that was a big hint.